Everyone is envious of Tang Luoqian, a rich, pretty girl who will be married to the young master of the Luo household, Luo Zhan. But, nobody knows that Tang Luoqian has a blind younger sister named Tang Ran, an unfavored daughter. After Ran moves out from home, she receives a biorobot as her sixteenth birthday gift. When she greets her new robot in the drear darkness, she hears the captivating voice of Luo Zhan. "Good evening, my master."